<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>iframe</title>
</head>
<body>

     <ul>
        <li><a href="6.table-3.html" target="content">业务内容1</a>
          <a href="5.table-2.html" target="content">业务内容2</a></li>
        <li>
           <iframe name="content">

           </iframe>
        </li>
     </ul>

</body>
</html>